Who are the authors and maintainers of pages such as this one? How does one contact them to suggest particular emendations?
Most pages, including this one, of the help center are the same over most sites and are maintained by SE staff.
You could use "Contact" in the footer or create a feature-request on this or the main meta.
There are only a few pages that are editable by per-site moderators. For those, you could create a meta thread here or ask us in chat about it.
[I am not sure if there is a handy list to know which is which. You could always ask us in chat first. Another test can be to check if the page is identical on several other sites. If it is it is likely not per-site editable.]